As a sidenote, I wonder why they chose to call it "Reach"... I just got done playing some Halo: Reach so that came to mind immediately. But I suspect it's more because of the symbolism of "reaching" more devices?
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RicketOct 4 '10 at 4:47

Sorrry,but i dont know where are these project properies. Could someone tell me?
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user7354May 14 '11 at 7:36

@Romantyk12 - i56.tinypic.com/2iqeu6t.png Hopefully this image helps. After clicking properties on the right-click pop up, the first tab labelled 'XNA Game Studio' has settings near the top to choose Reach or HiDef profile.
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DManMay 14 '11 at 15:48

after changing properties to reach same error is appearing
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user26573Feb 20 '13 at 21:45

@maryam It's possible that your graphics card does not support the requirements of even the Reach profile, which requires at least Shader Model 2.0, and a few other features which should be common on GPUs of that era - see the table linked in my answer for details. (Unless the error message itself still says "HiDef profile" - then you've not changed the setting correctly / for the correct project.)
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Andrew RussellFeb 22 '13 at 11:51

It needs a card that had most of the capabilities that a DX10 card has, but it still runs on DX9.
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LukeNFeb 21 '13 at 6:47

Between DX9c and DX10 there are increases to the max texture size, increases to the maximum # of texture references, increases on the number of shader commands to name a few.
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RobCurrFeb 22 '13 at 22:22